How to Reduce Amazon ACoS in 2026: 9 Strategies That Actually Work
If your Amazon ACoS is creeping above 30%, you’re handing profit back to Amazon on every sale. It’s one of the most common — and most fixable — problems sellers face.
This guide walks through exactly what ACoS is, what a good number looks like in 2026, and nine practical ways to bring it down without tanking your sales volume.
What Is Amazon ACoS (and Why Does It Matter)?
ACoS stands for Advertising Cost of Sale. It measures how much you spend on ads for every pound or dollar of revenue those ads generate.
ACoS Formula:
ACoS = (Total Ad Spend ÷ Total Ad Revenue) × 100
So if you spent £200 on ads and generated £1,000 in ad-attributed revenue, your ACoS is 20%.
Simple enough — but the number alone doesn’t tell you whether you’re profitable. For that, you need to compare ACoS against your profit margin. If your margin is 25% and your ACoS is 30%, every ad click is losing you money.
Your break-even ACoS is the point where ad spend equals gross profit. Anything below that is profitable; anything above is a loss.
What Is a Good Amazon ACoS in 2026?
There’s no universal “good” ACoS — it depends entirely on your margin, product stage, and strategy:
- New product launch: 40–60% is often acceptable. You’re buying rank and reviews, not immediate profit.
- Established product: 15–25% is healthy for most categories.
- High-margin products (50%+ margin): You can tolerate a higher ACoS.
- Low-margin products (15–20% margin): You need ACoS below 12–15% to stay profitable.
One metric gaining traction alongside ACoS is TACoS (Total Advertising Cost of Sale), which measures ad spend against total revenue — including organic sales. A product with a 35% ACoS but a 10% TACoS is actually performing well because ads are driving organic rank and sales too.
Why Is Your Amazon ACoS High? Common Root Causes
Before optimising, diagnose the problem. High ACoS usually traces back to one of these:
Poor keyword targeting: Bidding on broad or irrelevant terms wastes spend on shoppers who’ll never convert. A seller of premium kitchen knives bidding on “knife” will burn through budget on everyone from school kids to costume buyers.
Weak product listings: Even well-targeted clicks won’t convert if your title, images, or bullets are unclear. Low conversion rates inflate ACoS because you’re paying for traffic that doesn’t buy.
No negative keywords: Every search term that triggers your ad but doesn’t convert is costing you money. Most accounts have dozens of these running quietly in the background.
Overbidding on low-intent placements: Top-of-search placements command premium bids. But not every product needs to lead from the front. Overbidding for placement burns budget that could be better spent elsewhere.
Unchecked automated campaigns: Auto campaigns are great for discovery — terrible as a long-term strategy without active management. Left alone, they accumulate irrelevant traffic fast.
9 Strategies to Reduce Amazon ACoS Without Losing Sales
1. Fix Your Listing Before Touching Bids
Ad optimisation is only as good as your conversion rate. If your listing is weak, no bid strategy will save it.
Check your main image (is it compelling against competitors on the search results page?), your title (does it lead with the most searched term?), and your bullet points (do they answer objections, not just list features?). A 5% improvement in conversion rate has the same effect on ACoS as reducing your bids by 5% — and it helps your organic ranking too.
Aim for a conversion rate above 10–12% for established products. Anything below 7–8% signals a listing problem, not a PPC problem.
2. Add Negative Keywords Every Week
This is the fastest lever for cutting wasted spend. Pull your search term report weekly and identify terms that are generating clicks but zero purchases over a 30–60 day window.
Add these as exact-match negatives at the campaign or ad group level. For auto campaigns, add non-converting terms as phrase or exact negatives to tighten targeting without killing discovery entirely.
Most accounts that have never done this properly will find 20–40% of their spend going to terms with zero conversions. Cutting that spend alone can drop ACoS significantly within a month.
3. Separate Auto and Manual Campaigns
Running auto and manual targeting together inside the same campaign muddies your data and your control.
The right structure is:
- Auto campaign (low bids): Discovery tool. Let it find new search terms.
- Manual exact match campaign: Take your best converting terms from auto and bid on them directly with tighter control.
- Manual phrase match campaign: Expand coverage while staying relevant.
Harvest winning search terms from auto into manual campaigns weekly. This shifts spend toward proven performers and away from experimental traffic.
4. Use Bid Adjustments by Placement
Amazon lets you adjust bids for three placement types: top of search, rest of search, and product detail pages.
Check your placement performance report. You’ll often find that product page placements have higher ACoS than top-of-search, or vice versa. Reduce multipliers for underperforming placements and increase them for profitable ones.
This single adjustment can shift your effective ACoS by 5–8 percentage points in competitive categories.
5. Pause Underperforming Keywords — Don’t Just Lower Bids
A common mistake is reducing bids on struggling keywords and hoping they improve. Often, a keyword that has spent £50+ with zero conversions is simply the wrong keyword for your product. No bid level will fix a fundamental mismatch between search intent and your product.
Set a spending threshold — say, £30 or 2× your product’s selling price — and pause any keyword that hits that threshold without a conversion. Review paused keywords quarterly; occasionally a keyword will start converting seasonally.
6. Improve Your Amazon Images and A+ Content
In 2026, Amazon’s search algorithm — including Rufus, its AI shopping assistant — factors in engagement signals like click-through rate and dwell time. Better images don’t just convert more shoppers; they signal to the algorithm that your listing is relevant, which supports organic ranking and reduces dependence on paid traffic.
A+ content (available to Brand Registry holders) has been shown to increase conversion rates by 3–10%. Higher conversions mean each click produces more revenue, which directly lowers ACoS without touching a single bid.
7. Increase Prices Strategically
This sounds counterintuitive, but a price increase of even 5–10% on the right product can reduce ACoS significantly because your revenue per sale goes up while ad spend stays the same.
If you’re operating in a category where your product is priced below mid-market — and reviews support it — test a price increase on your best-selling variation. Monitor unit session percentage (conversion rate) closely. If it stays stable, the price increase is profitable and your ACoS will drop.
8. Optimise by Dayparting
Amazon doesn’t natively support dayparting (scheduling ads by time of day) for most campaign types, but you can manually adjust or pause campaigns during your worst-converting hours using third-party tools or Amazon’s bulk operations.
Pull your hourly performance data and look for consistent patterns. Many sellers find their ACoS spikes late at night or early morning — times when browsing behaviour differs from buying behaviour. Reducing bids during these windows, even modestly, recovers margin over time.
9. Run a Full Keyword Match Type Audit
Over time, campaigns accumulate keywords that were added on instinct rather than data. A quarterly match type audit helps clean this up.
For each keyword, ask:
- Is this generating sales at or below my target ACoS?
- Is it broad match bleeding spend into irrelevant searches?
- Should it be promoted to exact match, demoted, or paused?
Move high performers to exact match. Add phrase negatives to contain broad match bleed. Pause anything with high spend and low conversion over a meaningful time window (60–90 days minimum).
ACoS vs TACoS: Which Should You Track?
Track both — they answer different questions.
ACoS tells you how efficient your advertising is. High ACoS means your campaigns need optimisation.
TACoS tells you how dependent your business is on ads. As your product builds organic rank (driven partly by ad-fuelled sales velocity), TACoS should decrease over time even if ACoS stays flat. A declining TACoS signals that your product is growing organically, which is the goal.
Most healthy, established Amazon products operate at:
- ACoS: 15–25%
- TACoS: 8–15%
If your TACoS is high (above 25%), you’re funding almost all your sales through ads — a sign that organic rank is weak and you need to address listing quality and review count alongside PPC.
How Amazon’s AI (Rufus) Is Changing ACoS in 2026
Amazon’s Rufus AI assistant now handles a growing share of product discovery. Rufus answers conversational shopper questions and surfaces products based on relevance signals — not just keyword matching.
What this means for your ACoS: keyword-only strategies are becoming less efficient. A product with strong A+ content, high ratings, detailed bullet points, and positive review sentiment will surface naturally in Rufus results, reducing your reliance on paid clicks for visibility.
The practical takeaway: invest in listing quality and review generation alongside PPC. Sellers who treat advertising as a standalone lever — rather than part of a full account strategy — will find ACoS climbing as AI-driven search changes the rules.
When to Ask for Help
Reducing ACoS is straightforward in principle but time-consuming in execution. Pulling weekly search term reports, running bid adjustment tests, restructuring campaigns, and keeping up with Amazon’s algorithm changes is a real job — not a weekend task.
If your monthly ad spend is above £2,000–£3,000, the cost of getting this wrong (or not optimising at all) typically exceeds the cost of professional management.
At ESOLS, our Amazon PPC team manages accounts across UK, US, and EU marketplaces. We handle campaign structuring, weekly negative keyword hygiene, bid adjustments, listing recommendations, and monthly performance reporting — so you can focus on growing your product catalogue rather than debugging Sponsored Products.
Book a free Amazon PPC audit with ESOLS →
FAQs
For new product launches, an ACoS of 40–60% is often acceptable because you’re building sales velocity and organic rank, not optimising for short-term profit. Once reviews and organic ranking are established (typically 60–90 days in), the target shifts to break-even and then profitable ACoS.
With active management — weekly negative keyword additions and bid adjustments — most accounts see measurable ACoS improvement within 4–8 weeks. Structural campaign changes (separating match types, restructuring ad groups) typically show impact within 2–4 weeks as data accumulates.
In theory, yes — if your organic sales far outpace your ad-attributed sales. In practice, most sellers maintain some ad spend to protect placements and drive incremental sales. A TACoS below 5–8% on a profitable product is an excellent benchmark.
Not directly. ACoS is an advertising metric, not an organic one. However, the sales velocity generated by well-run ads does influence organic ranking. More sales → higher BSR → better organic position → lower dependence on ads → lower TACoS over time.
